Hi,
I have a servlet where I try to include other resources (html files
mostly) like this (displayURI is a String with the name of the resource
to include):
CharResponseWrapper responseWrapper = new CharResponseWrapper(response);
RequestDispatcher rqd =
getServletContext().getRequestDispatcher(displayURI);
try {
rqd.include(request, responseWrapper);
out.write(responseWrapper.toString());
} catch (Exception e) {
out.println(e);
}
CharResponseWrapper is a class I found in an article or tutorial about
filters on java.sun.com. It should function as a buffer to hold the
response or contents of the included resource, and it looks like this:
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class CharResponseWrapper extends HttpServletResponseWrapper {
private CharArrayWriter output;
public String toString() {
return output.toString();
}
public CharResponseWrapper(HttpServletResponse response) {
super(response);
output = new CharArrayWriter();
}
public PrintWriter getWriter() {
return new PrintWriter(output);
}
}
It works perfectly when the included resource is an html file, but if it
is an xml file I get this:
java.lang.IllegalStateException: getWriter() has already been called for
this response
Why - and how do I avoid this ?
I'm running this on Tomcat 4, which normally generates a directory
listing when given the name of one of the directories below its webapp
directory. If I try to include that I don't get anything at all - not
even an exception...
I haven't tried to include the output from another servlet yet.
Thnx in advance
Claus Nielsen
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